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annotate planemo/lib/python3.7/site-packages/pip/_internal/utils/deprecation.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 """
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2 A module that implements tooling to enable easy warnings about deprecations.
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3 """
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4 from __future__ import absolute_import
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5
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6 import logging
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7 import warnings
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8
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9 from pip._vendor.packaging.version import parse
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10
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11 from pip import __version__ as current_version
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12 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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13
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14 if MYPY_CHECK_RUNNING:
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15 from typing import Any, Optional
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16
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17
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18 DEPRECATION_MSG_PREFIX = "DEPRECATION: "
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19
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20
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21 class PipDeprecationWarning(Warning):
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22 pass
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23
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24
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25 _original_showwarning = None # type: Any
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26
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27
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28 # Warnings <-> Logging Integration
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29 def _showwarning(message, category, filename, lineno, file=None, line=None):
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30 if file is not None:
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31 if _original_showwarning is not None:
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32 _original_showwarning(
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33 message, category, filename, lineno, file, line,
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34 )
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35 elif issubclass(category, PipDeprecationWarning):
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36 # We use a specially named logger which will handle all of the
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37 # deprecation messages for pip.
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38 logger = logging.getLogger("pip._internal.deprecations")
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39 logger.warning(message)
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40 else:
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41 _original_showwarning(
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42 message, category, filename, lineno, file, line,
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43 )
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44
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45
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46 def install_warning_logger():
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47 # type: () -> None
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48 # Enable our Deprecation Warnings
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49 warnings.simplefilter("default", PipDeprecationWarning, append=True)
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50
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51 global _original_showwarning
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52
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53 if _original_showwarning is None:
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54 _original_showwarning = warnings.showwarning
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55 warnings.showwarning = _showwarning
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56
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57
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58 def deprecated(reason, replacement, gone_in, issue=None):
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59 # type: (str, Optional[str], Optional[str], Optional[int]) -> None
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60 """Helper to deprecate existing functionality.
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61
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62 reason:
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63 Textual reason shown to the user about why this functionality has
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64 been deprecated.
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65 replacement:
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66 Textual suggestion shown to the user about what alternative
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67 functionality they can use.
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68 gone_in:
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69 The version of pip does this functionality should get removed in.
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70 Raises errors if pip's current version is greater than or equal to
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71 this.
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72 issue:
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73 Issue number on the tracker that would serve as a useful place for
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74 users to find related discussion and provide feedback.
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75
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76 Always pass replacement, gone_in and issue as keyword arguments for clarity
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77 at the call site.
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78 """
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79
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80 # Construct a nice message.
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81 # This is eagerly formatted as we want it to get logged as if someone
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82 # typed this entire message out.
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83 sentences = [
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84 (reason, DEPRECATION_MSG_PREFIX + "{}"),
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85 (gone_in, "pip {} will remove support for this functionality."),
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86 (replacement, "A possible replacement is {}."),
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87 (issue, (
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88 "You can find discussion regarding this at "
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89 "https://github.com/pypa/pip/issues/{}."
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90 )),
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91 ]
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92 message = " ".join(
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93 template.format(val) for val, template in sentences if val is not None
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94 )
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95
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96 # Raise as an error if it has to be removed.
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97 if gone_in is not None and parse(current_version) >= parse(gone_in):
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98 raise PipDeprecationWarning(message)
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99
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100 warnings.warn(message, category=PipDeprecationWarning, stacklevel=2)